:root {
    --color-bg: #f5f2f0;
    --color-plum: #4a3f5e;
    --color-coral: #e8a0a0;
    --color-mint: #a8d8c5;
    --color-lavender: #c5b8d9;
    --color-charcoal: #3e3a42;
    --color-pewter: #7a7580;
    --color-saffron: #f0d9a0;
    --color-frost: #b8e0d2;
    --grid-columns: 12;
    --grid-gutter: 32px;
    --baseline: 24px;
    --bounce: cubic-bezier(0.34, 1.56, 0.64, 1);
    --breathe: cubic-bezier(0.4, 0, 0.2, 1);
    --margin: 48px;
}

*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html, body {
    width: 100vw;
    height: 100vh;
    overflow: hidden;
    background-color: var(--color-bg);
    font-family: 'Libre Baskerville', Georgia, serif;
    color: var(--color-charcoal);
}

#observatory {
    position: relative;
    width: 100vw;
    height: 100vh;
    overflow: hidden;
}

/* ============================
   BREATH INDICATOR
   ============================ */

#breath-indicator {
    position: absolute;
    top: 50%;
    left: 50%;
    width: 120px;
    height: 120px;
    border-radius: 50%;
    border: 0.5px solid var(--color-lavender);
    background: none;
    transform: translate(-50%, -50%);
    z-index: 0;
    opacity: 0;
    animation: breathe-in 800ms ease-out forwards,
               breathe-pulse 6s var(--breathe) 800ms infinite;
}

@keyframes breathe-in {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes breathe-pulse {
    0%, 100% { width: 120px; height: 120px; }
    50% { width: 128px; height: 128px; }
}

/* ============================
   DIAGONAL CONNECTORS SVG
   ============================ */

#connectors {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1;
    pointer-events: none;
}

#connectors .connector {
    stroke: var(--color-frost);
    stroke-width: 1;
    stroke-linecap: butt;
    shape-rendering: crispEdges;
    opacity: 0;
    transition: stroke-width 400ms ease;
}

#connectors.visible .connector {
    opacity: 1;
    transition: opacity 400ms ease, stroke-width 400ms ease;
}

#connectors .connector:hover {
    stroke-width: 2;
}

/* ============================
   HUD PANELS - SHARED
   ============================ */

.hud-panel {
    position: absolute;
    z-index: 2;
}

/* ============================
   IDENTITY PANEL (Top-Left)
   ============================ */

#identity-panel {
    top: calc(var(--baseline) * 3);
    left: var(--margin);
    width: calc((100vw - 2 * var(--margin) - 11 * var(--grid-gutter)) / 12 * 4 + 3 * var(--grid-gutter));
    max-width: 420px;
    padding: var(--baseline) calc(var(--baseline) * 1.25);
    border: 1px solid var(--color-lavender);
    background: rgba(255, 255, 255, 0.85);
    opacity: 0;
    transform: translateX(-120%);
}

#identity-panel.animate-in {
    animation: slide-from-left 700ms var(--bounce) forwards;
}

.panel-title {
    font-family: 'Barlow Condensed', sans-serif;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.18em;
    font-size: clamp(1.1rem, 2.2vw, 1.6rem);
    color: var(--color-plum);
    line-height: var(--baseline);
    margin-bottom: calc(var(--baseline) * 0.5);
}

.timestamp {
    display: block;
    font-family: 'IBM Plex Mono', monospace;
    font-weight: 300;
    font-size: 0.7rem;
    letter-spacing: 0.12em;
    color: #9b8fb0;
    margin-bottom: calc(var(--baseline) * 0.5);
}

.panel-description {
    font-family: 'Barlow Condensed', sans-serif;
    font-weight: 300;
    text-transform: uppercase;
    letter-spacing: 0.18em;
    font-size: clamp(0.7rem, 1.2vw, 0.85rem);
    color: var(--color-plum);
    line-height: 1.6;
}

/* ============================
   METRIC RIBBON (Top-Right)
   ============================ */

#metric-ribbon {
    top: calc(var(--baseline) * 2);
    right: var(--margin);
    left: auto;
    width: calc((100vw - 2 * var(--margin) - 11 * var(--grid-gutter)) / 12 * 5 + 4 * var(--grid-gutter));
    max-width: 600px;
    display: flex;
    flex-wrap: wrap;
    gap: 0 clamp(16px, 2.5vw, 40px);
    align-items: baseline;
    padding: calc(var(--baseline) * 0.75) 0;
    border: none;
    background: transparent;
    opacity: 0;
    transform: translateX(120%);
}

#metric-ribbon.animate-in {
    animation: slide-from-right 700ms var(--bounce) forwards;
}

.metric {
    font-family: 'Roboto Condensed', sans-serif;
    font-weight: 400;
    text-transform: uppercase;
    letter-spacing: 0.25em;
    font-size: clamp(0.65rem, 1.1vw, 0.85rem);
    color: var(--color-pewter);
    transition: color 600ms ease-out;
    white-space: nowrap;
}

.metric:hover {
    color: var(--color-coral);
}

/* ============================
   NARRATIVE PANEL (Bottom-Left)
   ============================ */

#narrative-panel {
    top: calc(var(--baseline) * 14);
    left: var(--margin);
    width: calc((100vw - 2 * var(--margin) - 11 * var(--grid-gutter)) / 12 * 5 + 4 * var(--grid-gutter));
    max-width: 520px;
    height: calc(100vh - var(--baseline) * 14 - var(--margin));
    max-height: 400px;
    overflow: hidden;
    box-shadow: 0 4px 32px rgba(120, 100, 160, 0.08);
    background: rgba(255, 255, 255, 0.6);
    padding: var(--baseline) calc(var(--baseline) * 1.25);
    opacity: 0;
    transform: translateY(80%);
}

#narrative-panel.animate-in {
    animation: slide-from-bottom 700ms var(--bounce) forwards;
}

.narrative-track {
    display: flex;
    width: 200%;
    height: 100%;
    transition: transform 800ms var(--bounce);
}

.narrative-track.page-2 {
    transform: translateX(-50%);
}

.narrative-page {
    width: 50%;
    flex-shrink: 0;
    position: relative;
    padding-right: 36px;
}

.section-heading {
    font-family: 'Barlow Condensed', sans-serif;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.18em;
    font-size: clamp(0.85rem, 1.6vw, 1.1rem);
    color: var(--color-plum);
    margin-bottom: var(--baseline);
    line-height: var(--baseline);
}

#narrative-panel p {
    font-family: 'Libre Baskerville', Georgia, serif;
    font-weight: 400;
    font-size: clamp(0.9rem, 1.4vw, 1.05rem);
    line-height: 1.8;
    color: var(--color-charcoal);
    margin-bottom: var(--baseline);
    text-align: left;
}

#narrative-panel .narrative-italic {
    font-style: italic;
}

/* Chevron Navigation */

.chevron {
    position: absolute;
    bottom: 8px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
    color: var(--color-plum);
    opacity: 0.4;
    transition: opacity 300ms ease;
}

.chevron:hover {
    opacity: 1;
}

.chevron-right {
    right: 4px;
}

.chevron-left {
    left: 4px;
}

.chevron svg {
    display: block;
}

/* ============================
   SIGNAL GRAPH (Bottom-Right)
   ============================ */

#signal-graph {
    top: calc(var(--baseline) * 16);
    right: var(--margin);
    width: calc((100vw - 2 * var(--margin) - 11 * var(--grid-gutter)) / 12 * 6 + 5 * var(--grid-gutter));
    max-width: 560px;
    height: calc(var(--baseline) * 9);
    position: absolute;
    opacity: 0;
    transform: translateX(100%);
}

#signal-graph.animate-in {
    animation: slide-from-right-graph 700ms var(--bounce) forwards;
}

/* Signal Bars */

.signal-bar {
    position: absolute;
    height: 14px;
    background: var(--color-coral);
    opacity: 0.6;
    border-radius: 0;
}

.bar-1 {
    top: 0;
    left: 20%;
    width: 120px;
}

.bar-2 {
    top: calc(var(--baseline) + 14px);
    left: 10%;
    width: 200px;
}

.bar-3 {
    top: calc(var(--baseline) * 2 + 28px);
    left: 30%;
    width: 80px;
}

/* Signal Triangles */

.signal-triangle {
    position: absolute;
    width: 48px;
    height: 48px;
    background: var(--color-saffron);
    clip-path: polygon(0 100%, 50% 0, 100% 100%);
}

.tri-1 {
    top: calc(var(--baseline) - 8px);
    left: calc(20% + 100px);
}

.tri-2 {
    top: calc(var(--baseline) * 3 + 10px);
    left: calc(10% + 160px);
}

/* Signal Needle */

.signal-needle {
    position: absolute;
    left: 55%;
    top: 0;
    width: 1px;
    height: 100%;
    background: var(--color-plum);
}

/* Signal Dots */

.signal-dot {
    position: absolute;
    width: 6px;
    height: 6px;
    background: var(--color-mint);
}

.dot-1 { top: calc(var(--baseline) * 1); left: 15%; }
.dot-2 { top: calc(var(--baseline) * 3); left: 40%; }
.dot-3 { top: calc(var(--baseline) * 5); left: 65%; }
.dot-4 { top: calc(var(--baseline) * 2); left: 75%; }
.dot-5 { top: calc(var(--baseline) * 7); left: 25%; }

/* Micro Labels */

.micro-label {
    position: absolute;
    font-family: 'IBM Plex Mono', monospace;
    font-weight: 300;
    font-size: 0.7rem;
    letter-spacing: 0.12em;
    color: #9b8fb0;
}

.label-1 { bottom: var(--baseline); left: 15%; }
.label-2 { bottom: 0; left: 60%; }
.label-3 { top: calc(var(--baseline) * 6); right: 10%; }

/* ============================
   ENTRANCE ANIMATIONS
   ============================ */

@keyframes slide-from-left {
    from {
        opacity: 0;
        transform: translateX(-120%);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes slide-from-right {
    from {
        opacity: 0;
        transform: translateX(120%);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes slide-from-bottom {
    from {
        opacity: 0;
        transform: translateY(80%);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes slide-from-right-graph {
    from {
        opacity: 0;
        transform: translateX(100%);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

/* ============================
   RESPONSIVE (< 768px)
   ============================ */

@media (max-width: 767px) {
    :root {
        --margin: 24px;
        --grid-gutter: 16px;
    }

    #identity-panel {
        position: relative;
        top: auto;
        left: auto;
        width: calc(100vw - 2 * var(--margin));
        max-width: none;
        margin: var(--margin) auto calc(var(--baseline) * 0.5);
        transform: none;
        opacity: 1;
    }

    #metric-ribbon {
        position: relative;
        top: auto;
        right: auto;
        width: calc(100vw - 2 * var(--margin));
        max-width: none;
        margin: 0 auto var(--baseline);
        transform: none;
        opacity: 1;
        justify-content: flex-start;
    }

    #narrative-panel {
        position: relative;
        top: auto;
        left: auto;
        width: calc(100vw - 2 * var(--margin));
        max-width: none;
        max-height: 260px;
        margin: 0 auto var(--baseline);
        transform: none;
        opacity: 1;
    }

    #signal-graph {
        position: relative;
        top: auto;
        right: auto;
        width: calc(100vw - 2 * var(--margin));
        max-width: none;
        height: calc(var(--baseline) * 7);
        margin: 0 auto;
        transform: none;
        opacity: 1;
    }

    #observatory {
        height: auto;
        min-height: 100vh;
        overflow-y: auto;
    }

    #connectors {
        display: none;
    }

    #breath-indicator {
        width: 80px;
        height: 80px;
        opacity: 1;
        animation: breathe-pulse-mobile 6s var(--breathe) infinite;
    }

    @keyframes breathe-pulse-mobile {
        0%, 100% { width: 80px; height: 80px; }
        50% { width: 86px; height: 86px; }
    }

    .hud-panel.animate-in {
        animation: none;
        opacity: 1;
        transform: none;
    }
}